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Hard coating of an impact surface of a solenoid actuator and fuel injector using same

Inactive Publication Date: 2006-04-18
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]In yet another aspect of the present invention, there is a method of increasing the durability of a solenoid actuator by coating an impact surface of at least one of a stator and an armature comprised of relatively soft component. The coating includes a relatively hard material.

Problems solved by technology

Thus, the relatively soft, magnetic materials comprising the stator and the armature will be subjected to repeated impacts, which may lead to undesirable wear and decrease the durability of the solenoid actuators and undermine the functioning and / or predictability of the valve.

Method used

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  • Hard coating of an impact surface of a solenoid actuator and fuel injector using same
  • Hard coating of an impact surface of a solenoid actuator and fuel injector using same
  • Hard coating of an impact surface of a solenoid actuator and fuel injector using same

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Embodiment Construction

[0011]Referring to FIG. 1, there is shown a schematic representation of an engine 10 according to the present invention. The engine 10 includes an engine housing 11, to which a low pressure actuation fluid reservoir 13 is attached. The low pressure actuation fluid reservoir 13 preferably is an engine sump that includes an amount of low pressure engine lubricating oil. While low pressure actuation fluid reservoir 13 is preferably an oil pan that has engine lubricating oil, it should be appreciated that other fluid sources having an amount of available fluid, such as coolant, transmission fluid or fuel, could instead be used. A source of high pressure actuation fluid 12 is also attached to the engine housing 11. High pressure actuation fluid flowing out of the source of high pressure actuation fluid 12 is delivered to a fuel injector 16 via a fuel injector supply line 18. Once the high pressure actuation fluid has performed its work in the fuel injector 16, the actuation fluid is retu...

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Abstract

A fluid control valve assembly controls the flow of actuation fluid to and from a fuel injector. The fluid control valve assembly includes at least one solenoid actuator attached to a valve body. The solenoid actuator includes a stator and an armature comprised of a soft magnetic material. At least one of the armature and the stator include an impact surface. The impact surface is coated with a relatively hard, nonmagnetic material coating. Thus, the relatively hard, nonmagnetic material coating will protect the relatively soft, magnetic material comprising the stator and the armature, and increase the durability of the solenoid actuator and the fluid control valve assembly.

Description

TECHNICAL FIELD[0001]The invention relates generally to solenoid actuators, and more particularly to a hard coating impact surfaces of solenoid actuators utilized with fuel injectors.BACKGROUND[0002]In several diesel engines today, fluid control valves regulate the flow of actuation fluid to and from hydraulic devices, including but not limited to fuel injectors. Depending on the positioning of a valve member, the fluid control valve either connects the fuel injector to a source of high pressure actuation fluid causing the fuel injector to activate, or connects the fuel injector to a low pressure actuation reservoir causing the fuel injector to deactivate, reset itself, or remain inactive. Typically, the movement of the valve member is controlled by at least one solenoid actuator. For instance, hydraulically actuated fuel injectors, such as that shown in U.S. Pat. No. 6,161,770 issued to Sturman on Dec. 19, 2000, include a solenoid driven fluid control valve that is attached to an i...

Claims

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Application Information

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IPC IPC(8): B05B1/30F02M47/02F02M61/00F02M59/46F02M61/16F16K31/06
CPCF02M57/025F02M59/466F02M61/166F16K31/0613F02M63/0021F02M63/0019F02M2200/02F02M2200/9038
Inventor SHINOGLE, RONALD D.
Owner CATERPILLAR INC
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